Renascent Dream is a currency that Revival Catalyst uses to convert your normal gear into tier pieces. Given the enormous value of this currency, it is difficult to obtain in World of Warcraft Dragonflight.
HOW TO GET THE RENASCENT AWAKENING CHARGE & HOW TO GET ALTS: WORLD OF WARCRAF
Revival Catalyst is a bad luck protection mechanism added in Shadowlands that requires you to convert Mythic+ and catch-up gear into a tier set piece. It can be found in Thaldraszus, just a short ride from Valdrakken. Renascent Dream is the name of the currency, or more accurately, charges, that your Revival Catalyst has. One Renascent Dream is equal to one tier set piece. Here's how to get Renascent Dream in Dragonflight.
You will automatically receive a Renascent Dream, or Revival Catalyst charge, each week. Your only task is to complete the introductory quest Reviving the Machine from Watcher Koranos in Valdrakken and transfer it to Antuka in Tyrhold at the 59.73, 53.74 coordinates. This NPC is right next to the Revival Catalyst, so you can immediately transfer a piece of gear into a tier set.
Renascent Dream is a currency that you use to upgrade your gear into tier pieces. It's important to note that these costs are account-wide and not per character, so I recommend checking to make sure your main character has all of the tier set pieces before you start using them to equip your alts.